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A145999 Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3X3 plus 2,1 2,2 2,3 1,2 3,2. 0
1, 1, 2, 1, 2, 1, 7, 2, 23, 5, 132, 12, 836, 51, 8563, 317, 115954, 2654, 2274857, 30351, 60964251, 489559, 2304941344, 11104536, 120886008663, 350752586, 8909697213591, 15493779226, 915528841065256, 954798521885 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..30.

EXAMPLE

Maximal 8 X 8 example

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

.0.0.0.0.0.0.0.0

.0.0.0.0.0.0.0.0

.0.1.0.0.0.0.1.0

.1.1.1.0.0.1.1.1

.0.1.0.0.0.0.1.0

CROSSREFS

Sequence in context: A046749 A016543 A300585 * A198316 A011128 A245595

Adjacent sequences:  A145996 A145997 A145998 * A146000 A146001 A146002

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2008

STATUS

approved

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Last modified January 18 16:40 EST 2019. Contains 319271 sequences. (Running on oeis4.)